The 2016 LEGO employee exclusive set is called 50 Years on Track (4002016) and it has a whopping 1,141 pieces. The set celebrates six decades of LEGO trains since it was first released in 1966 and it features six different types of trains through the years including: 

• Motorized Train Set – 1966 
• Western Train – 1976 
• Monorail Transport System – 1987 
• Metroliner – 1991 Emerald Night – 2009 
• Winter Holiday Train – 2016.